Circuit board, connector assembly and cable harness
a technology of connector assembly and circuit board, which is applied in the direction of cross-talk/noise/interference reduction, fixed connection, and coupling device connection, etc., can solve the problems of unfavorable cable harness structure, unnecessary mode conversion, transmission error, etc., to reduce skew occurrence, reduce the effect of minimizing the deterioration of differential
Active Publication Date: 2019-07-16
JAPAN AVIATION ELECTRONICS IND LTD
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- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
The present invention relates to a circuit board that reduces skew (when signals distort due to bending) and minimizes the deterioration of differential to common-mode conversion. By preventing electrical interaction between differential traces at bending regions, and arranging a ground conductor portion between inner and outer trace portions, differential signals are transmitted as quasi-single ended signals. This minimizes deterioration of differential to common-mode conversion and reduces skew occurrence. The circuit board of the present invention achieves both reduction of skew occurrence and minimization of deterioration of differential to common-mode conversion.
Problems solved by technology
Accordingly, the cable harness having this structure is unfavorable.
Accordingly, skew occurs between a differential signal pair which passes through the modified differential traces, and thereby a transmission error occurs.
However, the remodeled shape of the inner trace distorts differential signals to cause unnecessary mode conversion where some of differential-mode signals are converted to common-mode signals.
Specifically, the remodeled differential traces have a drawback to cause differential to common-mode conversion.
Method used
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Embodiment Construction
[0022]As shown in FIG. 1, a cable harness 10 according to an embodiment of the present invention comprises a connector assembly 700 and a cable 600. The cable 600 functions as a second connecting object 600. Although the cable 600 shown in FIG. 1 is simply illustrated as a plurality of insulated single wires, an actual cable 600 is a multi-conductor cable. Specifically, the actual cable 600 comprises a plurality of insulated single wires, which are bundled together, and an outer cover covering the bundled insulated single wires.
[0023]As shown in FIG. 1, the connector assembly 700 of the present embodiment comprises a connector 500 and a circuit board 100. The connector 500 functions as a first connecting object 500.
[0024]Referring to FIG. 1, the connector 500 of the present embodiment is mateable with a mating connector (not shown) along a mating direction. In the present embodiment, the mating direction is an X-direction. As shown in FIG. 1, the connector 500 of the present embodim...
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A circuit board comprises at least a first wiring layer, a second wiring layer and a via. The first wiring layer is formed with a pair of first ends, a pair of second ends, a coupling portion, a pair of first trace portions and a pair of second trace portions. The coupling portion has a pair of first coupling points, a pair of second coupling points, an inner trace portion, an outer trace portion and a ground conductor portion. The inner trace portion has a length equal to a length of the outer trace portion. The ground conductor portion is arranged between the inner trace portion and the outer trace portion. The second wiring layer is formed with a ground pattern. The ground conductor portion is connected with the ground pattern through the via.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is based on and claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. JP2017-247425 filed Dec. 25, 2017, the contents of which are incorporated herein in their entireties by reference.BACKGROUND OF THE INVENTION[0002]This invention relates to a circuit board, a connector assembly and a cable harness.[0003]Referring to FIG. 7, JP-A 2004-14800 (Patent Document 1) discloses a circuit board 900 on which a pair of differential traces 920 is formed. The differential traces 920 have a pair of first trace portions 921, a pair of second trace portions 928 and a coupling portion 930. The first trace portions 921, the coupling portion 930 and the second trace portions 928 are coupled in this order. The coupling portion 930 has a pair of first coupling portions 932, a pair of third trace portions 933, a pair of through holes 934, a pair of fourth trace portions 936 and a pair of second coupling portions 937. The co...
Claims
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IPC IPC(8): H05K1/02H01R12/72H01R12/53
CPCH05K1/0222H05K1/0228H01R12/53H01R12/722H05K2201/09618H05K2201/09227H05K2201/09236H05K2201/09272H05K2201/09027H05K1/0245H05K1/0218H01R13/6471H01R24/60H05K1/0248H05K1/117H05K2201/10356H05K2201/09672
Inventor TODA, KENTARO
Owner JAPAN AVIATION ELECTRONICS IND LTD